Facilitated by project Optimize and conducted by a multidisciplinary group of partners, these landscape analyses highlight ongoing work related to five priority areas that comprise the vision for immunization supply systems in 2020. The analyses also highlight critical gaps that need to be addressed to achieve the vision. The five priority areas are vaccine and related products, supply system design, environmental impact, information systems, and human resources. The document is available as one large file or as six smaller files for easier downloading.